Mounting means for a deflection yoke assembly



June 21, 1960 D. H. HARSE ,9 2

MOUNTING MEANS FOR A DEFLECTION YOKB ASSEMBLY Filed Oct. 2, 1957 FlG.l.

INVENTOR: DOUGLAS H. HARSE HIS ATTORNEY.

United States PatentQ MOUNTING MEANS FOR A DEFLECTION YOKE ASSEMBLY Dougias H. Harse, North Syracuse, N.Y., assignor to general Electric Company, a corporation of New ork Filed Oct. 2, 1957, Ser. No. 687,778

I 3 Claims. (Cl. 31376) This invention relates to a deflection yoke assembly, and more particularly to a form and mounting clamp for securing such an assembly to the neck of a cathode ray tube.

In assembling television receivers, it is often necessary after the various components have been mounted on the chassis and in the cabinet to make tests and final adjustments in order that the receiver function properly. One such adjustment is required when mounting a deflection yoke assembly on the neck portion of a cathode ray tube. When the yoke is first assembled, means must be provided for holding it on the neck of the tube. This means must also allow for later adjustment, and then must finally lock the yoke in position after the final adjustment is made. These adjustments present a diificult problem particularly where space is at a premium. For example, in many portable television receivers, the neck of the picture tube extends through a small opening in a vertically mounted chassis. The final positioning of the yoke must then be accomplished through an extremely small opening.

Accordingly, it is an object of this invention to provide a new and improved means for mounting and after adjustment for finally positioning a deflection yoke assembly on the neck of a cathode ray tube. V

A further object of this invention is to provide an adjustable clamp for varying the amount of tension exerted in holding a yoke assembly on the neck of a cathode ray tube to allow for initially mounting, and then finally positioning the yoke on the cathode ray tube.

Still another object of this invention is to provide a new and improved deflection yoke clamp which may be easily operable through a small opening in a television chassis.

Another object of this invention is to provide a new and improved clamp which has an adjustable tensioning means, the tension of which may be readily changed.

A further object of this invention is to provide a new and improved means for attaching a deflection yoke assembly to the neck of a cathode ray tube which is simple, easy to operate and economical. I In carrying out this invention in one illustrative embodiment thereof, a deflection yoke form is provided having a cylindrical end portion with an annular seat thereon. An annular clamp is provided which is adapted to fit on the aforesaid seat. The clamp is provided with a spring having one end secured to a portion of said clamp and a free end thereof adapted to be latched in a plurality of positions on another end portion of the clamp, whereby the tension of the spring may be varied by latching the spring to various positions on the other end portion of the clamp.

These and other advantages of this invention will be more clearly understood from the following description taken in connection with the accompanying drawing, and its scope will be apparent from the appended claims.

In the drawing:

Fig; 1 shows a deflection yoke assembly mounted on 2,942,127 Patented June 21, 1960 "ice the neck of a cathode ray tube in accordance with this invention;

Fig. 2 is a partial cross-sectional view of Fig. 1 showing the deflection yoke clamp in a first engaged position; and

Fig. 3 shows the clamp in Fig. 2 in a second engaged position.

Referring now to Fig. l, a deflection yoke assembly designated generally with a reference character 10 has a plurality deflection coils 11, a core 12 and a core clamp 13 all mounted on a yoke form 15. An end portion 16 of yoke form 15 defines a cylindrical opening adapted to accommodate the neck of a cathode ray tube 5. End portion 16 is provided with annular flanges 17 and 18 defining an annular seat 20 therein. End portion 16 is also slot-ted at points 22. An annular yoke clamp 25 is adapted to fit in the annular seat 20. Clamp 25 is provided with an eyelet 26 on one end portion thereof, a step 28 and a flange 2? on the other end portion thereof. It also has a spring 36 which is secured to eyelet 26 by a twisted end loop 31. A twisted loop 32 which forms the other end portion of spring 30 is adapted to be engaged or latched to fiange 29 or to the step 28. Clamp 25 is also provided with an indentation 34 which is adapted to cooperate with one of the slots 22. With such an indentation and slots 22, the clamp is not free to rotate in the seat 20.

In assembling the yoke assembly 10 on the neck of the cathode ray picture tube 5, the clamp 25 is first positioned in the seat 20 or yoke form end 16 with the end 32 of spring 30 unlatched. When assembly 10 is placed on the neck of a picture tube 5, the free end 32 of spring 30 is latched in the first engageable position to flange 29 as shown in Fig. 2. This initial step puts a small amount of tension on spring 30, but it is not suflicient to securely lock the yoke assembly 10 into position. The assembly may still be adjusted.

After a final adjustment is made to determine the proper position of the yoke assembly 10 for best receiver operation, the spring end 32 is deflected over to the second engageable position or step 28 as shown in Fig. 3. When the spring 30 is deflected into its second position, greater tension is applied and the yoke is clamped tightly to the neck of tube 5.

It should be noted that the clamp 25 is easily operable and may readily be latched or unlatched. For example, to move the spring from latch position 29 to latch posi tion 28, a standard pair of long nose pliers may be used to apply pressure to the end 32 of spring 36 and to step 28 in order to pull the spring over to latch position 28.

This case of operation is an important consideration, particularly where the coil assembly 10 is mounted on neck of a tube which protrudes through a small opening in a vertically mounted chassis. In such a case, the final clamping of the yoke to the tube has to be accomplished through such an opening. By utilizing the yoke form and cooperating clamp in accordance with the present invention, the aforesaid function may be readily performed.

Since other modifications varied to fit particular operating requirements and environments will be apparent to those skilled in the art, the invention is not considered limited to the examples chosen for purposes of disclosure and covers all changes and modifications which do not constitute departures from the true spirit and scope of this invention.

What I claim as new and desire to secure by Letters Patent of the United States is:

1. In a deflection yoke assembly adaptedto be mounted on the neck of a cathode ray tube, a yoke form having a pair of cooperating flanges defining an annular seat on one end portion thereof, said end portion having a cylindrical configuration adapted to house the neck of a cathode ray tube, and an annular clamp having a tension spring attached to one end portion thereof the other end portion thereof being bent to form a plurality of steplike positions for engagement by a free end of said spring for varying the tension on said spring in accordance with the position engaged, said clamp being mounted in said annular seat.

2. The structure defined in claim 1 wherein said end portion of said yoke form has at least one slot therein and said annular ring has an indentation which is adapted for registration with said slot.

3. In a deflection yoke assembly adapted to be mounted on the neck of a cathode ray tube, a yoke form having a pair of cooperating flanges defining an annular seat on one end portion thereof, said end portion having a cylindrical configuration adapted to house the neck of a cathode ray tube, and'an annular clamp comprised of a partial ring, a step at one end of said ring comprised of a radial portion and a tangential portion, a flange at the end of said tangential portion, a tension spring, means for securing one end of said spring to the other end of said partial ring, a hook means at the other end of said tension spring for engagement with said flange on the radial portion of said step, said clamp being mounted in said annular seat.

References Cited in the file of this patent UNITED STATES PATENTS 240,225 Bradner Apr. 19, 1881 505,906 Stimpson Oct. 3, 1893 1,385,899 Barker July 26, 1921 1,740,957 Phillips Dec. 24, 1929 1,942,600 Hornung .-a; at"--- Jan. 9, 1934 2,333,806 Mauerer Nov. 9, 1943 2,852,712 Fabel Sept. 16, 1958 FOREIGN PATENTS 129,852 Germany Apr. 23, 1902 

